Research on heterogeneous joining of γ-TiAl alloy and steel
LIU Ye
SHANG Yonglai
LIANG Yongsen
GAO Fan
XUE Xingxu
JING Yongjuan
SONG Zhiwei
Abstract：γ-TiAl alloy,as a low-density,high-specific-strength,high-temperature-resistant structural material,holds significant application value in the aerospace field.However,its heterogeneous joining with steel presents challenges due to substantial differences in physical properties and the tendency to form brittle intermetallic compounds.Firstly,reviewing recent advances in joining technologies for γ-TiAl alloy and steel,with particular focus on welding techniques,joint performance optimization,and interfacial metallurgical behavior.Secondly,the study examines the effects of process parameter optimization,intermediate layer material selection(e.g.,high-entropy alloys),and post-weld heat treatment on joint performance enhancement.The research results indicate that adopting Ti/Nb+V composite intermediate layers and optimized brazing parameters(temperature and duration)can effectively suppress brittle phase formation while significantly improving joint strength(achieving a room-temperature tensile strength of 457 MPa).Mechanical joining methods(including interference fit and double-arc self-locking threaded structures)and hybrid joining techniques(combining interference fit with brazing)are shown to effectively address thermal expansion coefficient mismatch issues.Furthermore,a novel interface microstructure control strategy based on thermodynamic analysis is proposed to optimize interfacial metallurgical behavior.For future research directions,recommend prioritizing:additive manufacturing process optimization,development of advanced high-entropy alloy intermediate layers,and establishment of standardized performance evaluation protocols to facilitate the engineering application of γ-TiAl alloy heterogeneous joining technologies.For future research directions,some suggestions were provided,including prioritizing:optimization of additive manufacturing processes,development of advanced high-entropy alloy intermediate layers,and establishment of standardized performance evaluation protocols to advance the engineering application of γ-TiAl alloy heterojunction technol-ogy.
Keywords：γ-TiAl alloyheterogeneous material joiningwelding technologyjoint performance
Publication Date：2025-05-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 13-18 )